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In Gloiosiphonia capillaris, Bailey's Island, Casco Bay, Maine.

In 3-10 dm. water at low tide, in a tidal pond, Georgetown, Great Exuma, Bahamas.

Rather sparingly, in Batrachospermum vagum, Lake Chocorua, New Hampshire.

In almost stagnant water, Lynn, Massachusetts.

On Gymnogongrus linearis, on rocks in litoral, Land's End, San Francisco, California.

Floating, Wood's Hole, Massachusetts.

On stones and sticks in a muddy bay, Whidbey Island, Washington.

forming firm, light green, spherical or tuberculate floating masses, up to 2 cm. diam., Walnut Lake, Oakland Co., Michigan.

Forming soft masses of irregular form, floating among other algae, Horn Pond, Woburn, Massachusetts.

On Zostera marina, in company with Myrionema vulgare, Hecatonema maculans, etc., Wood's Hole, Massachusetts.

In a pool in salt marsh, Oakland, California.

Outlet of Lake Temescal, Oakland, California.

Among decaying vegetation on bottom of Lake Chocorua, New Hampshire.

On steep wet clay bank, Harpswell, Maine.

On stems of flowering plants, Lake Quannapowitt, Wakefield, Massachusetts.

Among Cladophora expansa etc., marsh pools, Stover's Point, Harpswell, Maine.

On moist ground, Medford, Massachusetts.

Forming a scum on a small pond, Medford, Massachusetts.

Among filamentous algae, Bridgeport, Connecticut.

On Nymphaea leaves in an artificial pond, Shelter Island, New York.

Among floating masses of algae, Winchester Upper Reservoir, Winchester, Massachusetts.

Along the edge of running water in a gutter by the roadside, North Berkeley, California.

in a water trough by the roadside, near Berkeley, California.

Floating in marsh pools, Mattapoisett, Massachusetts.

In clay pits near Tufts College, Medford, Massachusetts.

Forming a loose, fluffy mass on wet, sloping rock just above high water mark, Inner Mark Island, Casco Bay, Maine.

In stream near university, North Dakota.

Port Medway, Nova Scotia.

In Chorda Filum, Wood's hole, Massachusetts.

On stones and clay in Lake Merced, San Francisco, California.

Grown in a water culture in the Botanical Laboratory of the University of California, Berkeley, California.

Forming a felty layer of erect filaments on damp ground among Salicornia, etc., salt marsh, Alameda, California.

In leaves of Arisaema triphyllum, Crawford Ravine, White Mountains, New Hampshire.

In shallow water, Bridgeport, Connecticut.

Washed ashore, Mattapoisett, Massachusetts.

Attached to rocks, litoral zone, Land's End, San Francisco, California.

Dredged in 4-6 depth at low water, Stratford Shoal, Connecticut.

Ash Creek, Bridgeport, Connecticut.

In a shallow ditch by the roadside, Berkeley, California.

In a small pool of fresh water, Mountain View Cemetery, Oakland, California.

In rain pools, Key West, Florida.

In fresh water stream, just above beach, No Man's Land, Massachusetts.

On moist clayey ground, New Haven, Connecticut.

On a damp board fence, in the shade, Presidio, San Francisco, California.

Cultivated for six months in the Bot. Laboratory of the Univ. of Calif., Berkeley, California.

In egg membrane of Amblystoma punctatum, ponds in Middlesex Fells, Massachusetts.

On a steamer plying between San Francisco and Stockton, California, alternately in fresh and salt water.

On damp boards on a wharf, Coupeville, Island County, Washington.

Attached to larger algae, near low water mark, Conanicut, Rhode Island.

On Zostera, in shallow sandy pools, near low water mark, Revere Beach, Massachusetts.